Putting timestamp in CHANGELOG.org of modus-themes

[irenezerafa]

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On Sunday, November 7th, 2021 at 8:00 PM, fatiparty--- via Users list for the 
GNU Emacs text editor <help-gnu-emacs@gnu.org> wrote:

> Nov 7, 2021, 18:25 by help-gnu-emacs@gnu.org:
>
> > irenezerafa via Users list for the GNU Emacs text editor wrote:
> >
> > > Am using modus-themes for emacs, and at the end of
> > >
> > > modus-themes.el, there is the following code
> > >
> > > (provide 'modus-themes)
> > >
> > > ;; Local Variables:
> > >
> > > ;; time-stamp-pattern: "Last-Modified: <%Y-%02m-%02d %02H:%02M:%02S %5z>"
> > >
> > > ;; End:
> > >
> > > ;;; modus-themes.el ends here
> > >
> > > To insert the timestamp, I put (add-hook 'before-save-hook
> > >
> > > #'time-stamp) in the emacs init file,
> > >
> > > But I also need a way to synchronise the timestamp from modus-themes.el 
> > > into the
> > >
> > > CHANGELOG.org. What can I do for the time stamp to be inserted.
> > >
> > > I would like to have after the line
> > >
> > > #+OPTIONS: ':nil toc:nil num:nil author:nil email:nil
> > >
> > > the following
> > >
> > > Copyright (C) 2019-2021 Free Software Foundation, Inc.
> > >
> > > Author: Protesilaos Stavrou <info@protesilaos.com
> > >
> > > URL: https://gitlab.com/protesilaos/modus-themes
> > >
> > > Version: 1.6.0
> > >
> > > Last-Modified: <2021-11-05 10:36:21 +0200
> > >
> > > Package-Requires: ((emacs "27.1"))
> > >
> > > Keywords: faces, theme, accessibility
> >
> > Open the file in a buffer from Lisp, search for that line,
> >
> > format your data, insert it into the buffer, save/write the
> >
> > buffer to the file. Try to do each step interactively, when
> >
> > all of it works put it together into one function and have the
> >
> > hook call it.
>
> Can you give me a small elisp example to help me?

That would help a lot.  Can one put commands like that in an elisp function?